In DHCP Manager, select the Macros tab.
See How to Start and Stop DHCP Manager for information about DHCP Manager.
Select the macro to delete.
The Delete Macro dialog box prompts you to confirm that you want to delete the specified macro.
Select Notify DHCP Server of Change.
This selection tells the DHCP server to reread the dhcptab table to put the change into effect immediately after you click OK.